Telephotographic apparatus.



I 'i .1.3. Hopen-osmnsrnvm i .Tm j ln'czrbewmcjurrm TUI.

Toall whom if mayeoncem Y Be it known that I, Looewx J. R. Hons-r,-

a citizen of the United'States,`-residing in` tion; :md for' a fuller understanding of the said inrenfticn in connection withtheiollowing'description thereof it must he understood 'that the adjustments faboye referred to are entirely independent of, whatever focus- 'ing adjustment of th-epositiw'eelement may be' required to compensate forthe proximity of the object Vto lle photographed, sind 'the optical formulze-developed inthi's specifica'- ton will fully satisfy this condition when `the value F of the' tele-.photo system is'consirl'ered in` connection 4with the actual focus f of tile positive 'element und not with its equivalent or principal focus.

itlae distance (I, between tliefocal points of the positivo and the .negntne corn o'nents in accor-(larice with the 'following ormul'a.

vizz-f nnted ns 4n it follows l)that for any :ratio ofn'mgnificntion `which may lie' desired,

j must equal n, Wherebyl-will equal flXn,

- @nieuwe fixa-gun time f mamme mi-Mem 29,191; semanales;

It is Well known .that ,the magnica-ton -prodn'oedby .11 tele-.photo system depends on i Patented Mfg-y, 19.15.

It sill @bliebe seenzhatit will simsl further sa-leulation, if the distance -in parts-of the focal length of the negative lens, `because in .that case it i can beimm'edisibelyconcluded that for say` 3 diameters of niagni'f-icetion the distance d must be or This -fact also demonstrates-that -n-ll ypractically useful velues of d must lie between d.==o .nn-d d equals soA i because injthe first case F becomes 'infinite `and in 'the second oase F .equals f, and lthe tele system offers no magnification in this instance, the image plane eoinciding with the negative-lens. 4

For ythe better .explanation of my inver -tion reference is mede to .vt-lie accompany ing drawings forming part of this specifies,.- tion, illustrati-ng diagrarmnetieally' means -for-cerrying into effect iny said invention,

in which@ Figure 1, shows diametreally uV telef-photo system at its minimum dist-ence.. Fig. 2, shows the samel system at its maximum disermee. Fig: 3, shows the same system ml-y )usted to give a; magnification of 3 diam'- eters. Fig. 4, shows the same'system as adjusted in...Fi-g. 3 and in diagrammatic view, a mechanical means for its adjustment.

'SOI

'For the Sake er simpiieiy only single posi-tive und negative .eiements are shown4 1nl these drmvings, but .the 'scope lof Ithis as invention includes -as 'Well any-composite l elements, es they are subjee't to the seme i i opt-ical laws and. always huye their singleuival'ents.

lens.

ig. 1, theflenses .are placed so t-ht the the focal point n, 'of the -negative.iens.-N.

anisf parallel bundle f rfn-the negative lens und the focal length F, of 'the system is innite, sin 'i f point n, Yforms the focal point p, lith-sposi, 4- -tive lens P, and at the -sa'me time constitutes y In Figreihe agrumes-@weegthermo: 1

focal point fn, of llimit-ne tive lens N, eline parallel isotghe -o tical axis 'of f1 l equal to the focal lengt-h u v i i ,of the negati-ve lens, h ence in this ease- Y aud-consequently the magnifici-tion is 1 since;

. F l' y 1.

Referring now to Fig. 3, it will he ol)- Served that. if fo;- instnncethe dietance between the po'ut's p und 11., has been ad. justed to equal i; of -the focal length flo f the negativelens N, it will be seen' het by applying the 4seme rule,

i F-LLXn-Bf" Y 3 and conse uentl the` meguication produced by -t e te e-photo system" is 3, smce the image it produces is equal to 3 times the ize of the images .produced bythe positive element of a .focal length Furthermore in accordance with the laws of otics the ens Aand the image 1salways (1e-exi( when represents the ratio of magnilication, so that in the ease illustrated in Fig. 3,

the z nage will be placed behind the negative lens. The distance (nv-1);', can also be expressed nf,-f, and it will be observed that' -`for a negative lens of any given focal length theonl-y variable factor. m that expression -isthe value n; Comparing new the 'values of the distances d, with the corresponding or conj agate ima-ge dist-:mees E, `for the vary-ngyulues of n', inve `find respectively are continuously the .eictreme of a proportion, of 4which f, is 4c .icmetsmtly4 the geometrical mean.- 55.

Inasmulchfas in every individual ease the velue f, 1s constant, the vemetions in the' values of the conjugate distances d and E,"

conforming witl1 varyin rectangle-lever ACB, 4as dagrammatieally illustrated in Fig. 4. The arm CB 'is slid? ably guided in the pivoted sleeve G, the

center of the pivot of. which is placed exactly-at a disanoeg, behind. the image re,` ceivimg' surface J.' he point .C,-is' guided in.

on the points H'nd G;

' vih-atl clnimas new and desire to secueby.

cr values Yof n, can. be 4mechanically 'obtained by 'means of a the syscem und is 'rigily ettached' to -the sewing. of .the ngati'e'lens N, .so that 'this lens will move in vuse ,ivson with any-shftin of the point C. The arm. AC, paeaes at- "'7 through azpivobedguide sleeve supported by the. getting of the positive-lens I. imaginary line HG, which forms the by? potenuse ofthe rectangular Vtriangle HCG, is

The

also parallel' ho the .optical axes XY, hence 7 5v equally parallel to the pathof 4travel ofthe x C. When now "finally the dietetica `of v he oint C, `from vthe line HG, be made f 'equa --t'o'tfhe length f, of the ne 'ntvre lens1 N,'itis found .that a er. eed-ieder on sa,

`theline HG, drawnthroug l;v efepex C, no matter to. which .point the lutter has been 'y shined, divdesehe line HG, .at 0, insuch s manner that Horace-Omoo 9'" y `life' mag epresa Lheval-ue of OG 'in func. l

between the foca peints p' and n, o produce this magn-i'e'alion and eoneequently the correct congugute distances d un'd E, re- Spectively, .between the focal pox-nts ofthe positive 'and the-negative lens, nud-between iwf A Vthe lutter und the ,image surfaee for .va rying degrees ol 'lisation are automatically maintained during all ehi-bingsof' the point C, by the action of the rectangle-.lever AGB i .Having now full the nature andcbjects of :ny-invention' `as. well as m'an- .ner in .which the seme `xluuy be peromued,

Letters Pzient is: n 1. In telephoto'graphlc eppnmtus, 'e positive element, `a ,negative-element., :un image surf-,noe and opetive connect-:fons between" the same ndapted'toieause 'the varying 'dislances between the uegatxveelement andthe 1,30

iinage surface. to `aut-omntiealli abi-respond `with Ithe coniugate 4irlislunces between sind negut-ve element and :said positive element.

2. In tele-photoaphi 1-ppn mtas, u positive element move le galo and' ce' 'ing pivoted 4'gui means-lori. 'd

elzrtions ip, a negutive elemen'b- 4 along Saldjoplgieal axis'nnd enrrymgin'ngld a support 'y olanlmagefsurfaeee-levler,' the interiecf ich lis carried by .the v tiva" alemana .with IlA I surface. 

